Two stable QTL involved in adult plant resistance to powdery mildew in the winter wheat line RE714 are expressed at different times along the growing season |
| |
Authors: | H Muranty M-T Pavoine B Jaudeau W Radek G Doussinault D Barloy |
| |
Institution: | (1) INRA Agrocampus Rennes, UMR118 Amélioration des Plantes et Biotechnologies Végétales, BP 35327, 35653 Le Rheu Cedex, France;(2) Present address: INRA UR 0588 Amélioration Génétique et Physiologie Forestières, 2163 Avenue de la Pomme de Pin-CS40001-Ardon, 45075 Orleans Cedex 2, France |
| |
Abstract: | Powdery mildew (Blumeria graminis f. sp. tritici) is one of the major diseases of wheat (Triticum aestivum). Adult plant resistance (APR) to powdery mildew is considered more durable than resistance conferred by major race-specific
resistance genes. The objective of the present study was a better understanding of the genetic basis of APR in RE714 by means
of QTL analysis of several resistance scores along the growing season. A population of 160 recombinant inbred lines obtained
from the cross between RE714 and Hardi (susceptible) was assessed for APR under natural infection conditions during 3 years
and a genetic map with whole genome coverage was developed with microsatellite and AFLP markers in this population. Two major
QTL on chromosomes 5D and 6A were detected each year, and 6 minor QTL were detected only in 1 or 2 years. The QTL on chromosome
5D was detected during all the growing season each year and its R
2 value varied between 8.5 and 56.3%, whereas the QTL on chromosome 6A was detected at 1–4 scoring dates in the 3 years, and
its R
2 value varied between 6.1 and 20.5%. The two QTL explained between 24.4 and 52.1% of the phenotypic variance for AUDPC, depending
on the year. The models including QTL and cofactors in the composite interval mapping explained between 29 and 72% of the
variance. The molecular markers linked to the two major QTL could be used in marker-assisted selection for adult plant resistance
to powdery mildew.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
| |
Keywords: | QTL mapping Triticum aestivum Blumeria graminis f sp tritici Adult plant resistance |
本文献已被 SpringerLink 等数据库收录! |
|